getting a string as the return value from a system command

[CHEN Guang]

> Catherine Moroney wrote:
>> Hello,
>> 
>> I want to call a system command (such as uname) that returns a string,
>> and then store that output in a string variable in my python program.
>> 
>> What is the recommended/most-concise way of doing this?
>> 
>> I could always create a temporary file, call the "subprocess.Popen"
>> module with the temporary file as the stdout argument, and then
>> re-open that temporary file and read in its contents.  This seems
>> to be awfully long way of doing this, and I was wondering about 
>> alternate ways of accomplishing this task.
>> 
>> In pseudocode, I would like to be able to do something like:
>> hostinfo = subprocess.Popen("uname -srvi") and have hostinfo
>> be a string containing the result of issuing the uname command.
>> 
>> Thanks for any tips,
>> 
>> Catherine
> 
> import os
> txt = os.popen("uname -srvi")
> hostinfo = txt.readline()
> 
> Or if the command outputs a number of lines (such as 'ls'),
> use txt.readlines() to put the result into a list of strings.
> 
>      -=- Larry -=-
> 
os.popen3()  gives not only result but also error prompt (in case an error or warning happens)
    stdin,stdout,stderr  =  os.popen3('uname -srvi')
    resultText = stdout.read()
    errorText = stderr.read()
For more examples of os.popen3() please look at source code of PythoidC (http://pythoidc.googlecode.com or http://pythoidc.sf.net )
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